Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6d57236e26ac4ee…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:40:10 Authoring application: Microsoft Excel
MD5: 49f28a53ce275924b7285e35145a17f0 SHA-1: 74ed86ba663a13f83b4a585a982e2413e95d24a9 SHA-256: d6d57236e26ac4ee5290e8880cb382e902cf483f4a687f84313b9cd2fd6203fd
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely a downloader for a second-stage payload. No specific family could be identified.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9e11e8b18f2dd6b2d3f59d68488d41841e5885abed0ba2f317af55d092c32232		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6789 bytes

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